/**
 * Created by codeczx on 2018/3/29.
 */
public class Test {
    public static void main(String[] args) {
        Test test = new Test();
        System.out.println(test.test());
    }

    public <T> Box<T> test(){
        return (Box<T>) getBox();
    }

    public Box<?> getBox(){
        return new Box<Object>();
    }
}
